Phloem & translocation | Life processes | Biology | Khan Academy

Let's explore the translocation through phloem
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[@DanyalShabirr]

Active transport is also needed during unloading.

[@jiturajpurohit9801]

@@DanyalShabirr no it's happen bcoz of diffusion

[@DanyalShabirr]

@@jiturajpurohit9801 Haha, its active🙂

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Trust me I finished Biology course without understanding this 4 years, I can't believe that it was this EASY!

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true...briilliantly explained

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[@sethumrathnayake4920]

If u mentioned the sugar source and sugar sink it would have been more perfect. But its already perfect now : )

[@gururajkulkarni1701]

Am I the only one who noticed a minute mistake in 5:54. Osmosis is the movement of solvent from higher concentration to lower concentration. BTW grateful for your awesome explanation

[@Lujainmo-km8st]

He meant the sugar or solvent concentration , it was from low to high

[@Lujainmo-km8st]

he said to dilute the solution so the solution had less concentration of water but more of sugar

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samee

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[@jamieramquar5593]

This by far is the best analysis I've heard about the mechanism of translocation. Thank you so much!

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i missed this part at school. and i thought this is very hard part. but this tutor is perfect. Thanks a lot ❤

[@zainagilani2230]

Hey! Thank you for this great explanation. But I have doubt.. A plant can store starch in many areas, from the leaves down to the roots. What does this tell us about transport of sugar solution in phloem tube? Please answer ASAP cause I have to write and submit it..

[@zainagilani2230]

SANSKRUTI BAWANE I know that! but I asking what does it tells us about transport of sugar solution in phloem tube .

[@zainagilani2230]

swayam patel Okay. Thank you!

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[@mohitsinghania5155]

Thanks @khanacademy for making this video. All doubts are totally cleared now. Unterstood the whole topic of food transportation in plants through phloem.

[@sethumrathnayake4920]

Idk who might need this but in some plants in loading it moves from mesophyll cell to sieve tube elements via symplast using plasmodesmata

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[@aditishastri6087]

Why is only loading an active process? As in, the transportation from the phloem to the destination cell is through osmosis, but the loading process needs energy.

[@indiafirst7955]

We can just use energy once n then rest would be taking care of by the various (osmotic, pressure) gradient. It's like taking a cycle uphill n the downhill travel can happen (either left or right) without using energy.

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thank you so much! i had some doubts in translocation in plants, but now you've cleared them. Tomorrow i will get good grades i guess.

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Amazing explanation but Ialso expected to find some details about safe tubes and companion cells and all those stuff in the video!

[@surveersingh2552]

Sieve tubes you mean ....

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[@vikramgupta4616]

Sir then how in roots at night where xylem is present active process takes which helps in maintaining root pressure as u have told about this in previous video???

[@rajpalkaur5677]

exactly when the cells are dead, how does active process takes place?

[@manojmankotia5707]

The active process doesn't occur in the xylem. If u cut a section of the root hair ull have to go through layers of cells (epidermis,cortex,endodermis, pericycle) and then u reach the xylem.. the active transport takes place in these cells(which are live) which pushes the water into the xylem

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[@dr.rituparnaboradutta3235]

Why u crying

[@ishanyajaiswal4881]

Actually, the osmotic pressure of the phloem increases because the water that the cell already had, has been used up to generate energy (energy is generated by breaking the bonds of ATP with water) in order to move the sugar. Now this area has low concentration of water and that's why water from xylem flows into it, creating pressure and the need to move the sap either up or down.

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your explanation is so clear, systematic, and easy to understand. thank you very much

[@aasthakumari3999]

Sir you have told that loading and unloading are active process .But as you have told earlier that if concentration in storage cell is higher then it will automatically diffuse,so in that case is it also active process?

[@deshnadey7911]

no, thats just normal diffusion, what he said was, that certain amount of it gets diffused and if there is requirement for further amount of starch then energy is used which makes it an active process

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This video was amazing , can you please make a video on the dark phase of photosynthesis please

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[@zdiegi5493]

This was really fascinating! Thanks for the good explanation!

[@eilonj]

Very nice animation and exlpanation. One may ask why is water needed from the xylem to help transporting the concentrated phloem from a cell while the adjacent phloem cells have a low concentration and the flow can begin instantly.

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[@saineysaidyjah3963]

This video is very useful and will help me to understand the process of translocation and transpiration

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[@johntarwaytwalla1343]

It's amazing that xylem gives water to phloem to promote the movement of sucrose in the phloem tissue.

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Made concept simplistic and easy to remember

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[@tiyanainewal5667]

do phloem and xylem tubes have gaps in between to transfer water? if yes, aren't there any possibilities that the water will flow out just like a pipe leakage?

[@PranavKumar-dd2xo]

Is unloading ATP dependent, or it just occurs bcz of simple diffusion

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In the experiment of light is needed for photosynthesis we use black paper to cover the leaf then why can't the food is transported to the black paper covered region from not covered region where photosynthesis took place and prepared starch

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Where is the position of xylem and phloem sir??

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